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Nexperia USA Inc. 74AHCT594D,118
- Part No.:
- 74AHCT594D,118
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Shift Registers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
74AHCT594D,118.pdf
- Description:
- IC SHIFT REGISTER 8BIT 16-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:113
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Product details
Overview
74AHCT594D,118 from Nexperia is an 8-bit serial-in, parallel-out shift register with independent storage register, TTL-compatible input thresholds (VIH = 2.0 V, VIL = 0.8 V), dual positive-edge clocks (SHCP and STCP), and active-low asynchronous resets (SHR, STR). It operates from 4.5 V to 5.5 V across –40 °C to +125 °C and is used in LED matrix drivers and industrial I/O expanders requiring synchronized data latching.
For engineers reviewing the 74AHCT594D,118 datasheet, 74AHCT594D,118 pinout, 74AHCT594D,118 application, or 74AHCT594D,118 equivalent, this device supports cascaded serial-to-parallel conversion with guaranteed 70 MHz maximum clock frequency at 5 V, Schmitt-trigger inputs for noise immunity, and overvoltage-tolerant inputs up to 5.5 V - critical for mixed-voltage system interfacing and robust industrial control designs.
Technical Context
The 74AHCT594D,118 integrates two synchronous stages: a serial-input shift register feeding an 8-bit D-type storage register. Both SHCP and STCP are positive-edge triggered, enabling precise timing separation between data shifting and output latching - essential for glitch-free display refresh and buffered I/O control.
Independent SHR and STR inputs allow asynchronous reset of each stage without affecting the other; Q7S provides cascading capability, while all inputs feature Schmitt-trigger action and tolerate 5.5 V regardless of VCC, supporting hot-swap and level-shifting use cases in legacy TTL environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74AHCT - TTL-compatible CMOS, ensuring direct replacement of LS-TTL with lower power and higher noise immunity |
| Supply Voltage Range | 4.5 V to 5.5 V - matches standard 5 V systems and ensures compatibility with legacy TTL logic levels |
| Max Clock Frequency | 70 MHz at VCC = 5 V - enables high-speed serial loading for real-time LED scanning or sensor data aggregation |
| Propagation Delay (STCP → Qn) | ≤ 7.1 ns at VCC = 5 V, CL = 50 pF - guarantees sub-10 ns output update latency for time-critical latch operations |
| Input Thresholds | VIH = 2.0 V, VIL = 0.8 V - meets TTL voltage standards, eliminating need for external level shifters when interfacing with 5 V microcontrollers |
| Operating Temperature | –40 °C to +125 °C - qualified for under-hood automotive modules and industrial PLC backplanes |
| ESD Rating | HBM > 2000 V, CDM > 1000 V - withstands handling and board-level ESD events in automated assembly lines |
Pinout & Package
74AHCT594D,118 uses the SO16 (SOT109-1) package: plastic small outline, 16 leads, 3.9 mm body width, with gull-wing leads and standard 1.27 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 15 | Q0–Q7 | Parallel output terminals - drive LEDs, relays, or bus buffers directly; latched by STCP edge |
| 8 | GND | Ground reference for all internal logic and output stages; must be low-impedance for stable timing |
| 9 | Q7S | Serial output - connects to DS of next device for daisy-chained shift registers (e.g., multi-digit displays) |
| 10 | SHR | Active-low shift register reset - clears only the shift stage, preserving storage register contents during partial reinitialization |
| 11 | SHCP | Shift clock input - positive-edge triggered; advances serial data through all 8 stages on each rising edge |
| 12 | STCP | Storage clock input - positive-edge triggered; transfers current shift register contents to Q0–Q7 outputs simultaneously |
| 13 | STR | Active-low storage register reset - clears only the output latch, allowing shift register to continue loading new data |
| 14 | DS | Serial data input - accepts bitstream from MCU GPIO or previous Q7S; sampled on SHCP rising edge |
| 16 | VCC | Power supply - must be decoupled with 100 nF ceramic capacitor near pin to suppress switching noise |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent clocks | SHCP and STCP enable precise separation of data shifting and output latching - prevents metastability and output glitches during continuous streaming |
| Asynchronous stage-specific resets | SHR and STR allow selective clearing of shift or storage register without disturbing the other - simplifies error recovery in communication protocols |
| TTL-compatible input thresholds | VIH = 2.0 V / VIL = 0.8 V ensures seamless interface with legacy 5 V microcontrollers and logic families without level translation |
| Overvoltage-tolerant inputs | All inputs withstand up to 5.5 V regardless of VCC - supports mixed-supply systems and protects against transient overvoltage on control lines |
| Schmitt-trigger inputs | Provides hysteresis (typically 0.5 V) on all control pins - rejects noise on long PCB traces or noisy industrial environments |
Applications
| LED Matrix Driver | Industrial I/O Expander |
|---|---|
|
Use Scenario: Driving 8×8 monochrome LED displays in factory HMIs where microcontroller GPIOs are limited. IC Role / Device Role / Timing Role: Serially receives pixel data via SPI-like bitstream, then latches full row/column data to Q0–Q7 outputs on STCP edge for simultaneous LED activation. Use Value: Reduces required MCU pins from 16 (row+column) to 3 (DS, SHCP, STCP), while Q7S enables vertical stacking of multiple 74AHCT594D units for larger displays. |
Use Scenario: Adding 8 digital output channels to a PLC module controlling solenoid valves and indicator lamps. IC Role / Device Role / Timing Role: Acts as a buffered output latch - shift register loads command bits from controller, STCP synchronizes safe output update to avoid spurious actuation during data transfer. Use Value: Independent STR allows immediate deactivation of all outputs during fault conditions, while SHR permits reloading new commands without disturbing active outputs. |
| Remote Control Decoder Interface | Test Fixture Signal Generator |
|
Use Scenario: Interfacing infrared remote protocol decoders (e.g., NEC) to microcontrollers with limited interrupt-capable pins. IC Role / Device Role / Timing Role: Captures incoming IR pulse-width modulated bitstream via DS/SHCP, stores decoded command byte in storage register, and presents it in parallel for fast CPU readout. Use Value: Dual-clock architecture isolates timing-sensitive bit sampling (SHCP) from CPU-accessible data availability (STCP), eliminating race conditions during interrupt service. |
Use Scenario: Generating programmable stimulus patterns for functional testing of digital subsystems on production test benches. IC Role / Device Role / Timing Role: Loaded with precomputed test vectors via serial interface, then strobed to outputs using STCP to apply deterministic signal combinations to DUT inputs. Use Value: Cascadable Q7S enables expansion to 16/24-bit patterns using multiple devices, while 70 MHz max clock supports high-speed test vector execution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit serial-in/parallel-out shift register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74AHC594D,118 | CMOS input thresholds (VIH = 3.85 V @ 5.5 V); wider 2.0–5.5 V supply range | Better suited for mixed-voltage systems (e.g., 3.3 V MCU driving 5 V peripherals) due to rail-to-rail input tolerance | Select when interfacing with 3.3 V logic or requiring ultra-low ICC (< 4 μA typical) |
| SN74HC595DR | Single clock (SRCLK + RCLK), no independent SHR/STR; no Schmitt triggers; 2 V–6 V supply | Lacks stage-isolated reset and noise-immune inputs - less robust in electrically noisy industrial settings | Choose for cost-sensitive, non-critical consumer applications where simplified timing suffices |
Compared with 74AHC594D,118 and SN74HC595DR, the 74AHCT594D,118 uniquely balances TTL compatibility, dual-clock precision, and industrial-grade noise immunity - making it optimal for safety-critical latched outputs where input voltage margins and reset granularity matter.
Availability
74AHCT594D,118 is available at Aetrix Electronics and suitable for LED display drivers, industrial I/O expanders, and remote control decoder interfaces requiring stable component supply across automotive, factory automation, and test equipment programs.
Supply support for 74AHCT594D,118 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Nexperia is a global semiconductor expert delivering high-performance logic, analog, and MOSFET solutions optimized for efficiency, reliability, and miniaturization in high-volume applications.
The 74AHCT series targets industrial and automotive systems needing TTL-compatible logic with CMOS advantages - designed specifically for robust operation in harsh environments with wide temperature and noise margins.
FAQ
Can 74AHCT594D,118 operate at 3.3 V supply?
No - the 74AHCT594D,118 is specified only for 4.5 V to 5.5 V operation. Its TTL-compatible input thresholds (VIH = 2.0 V min) require VCC ≥ 4.5 V to guarantee proper logic recognition and output drive strength. For 3.3 V systems, use the 74AHC594D,118 variant instead, which supports 2.0–5.5 V and has CMOS input thresholds.
What happens if SHCP and STCP are tied together?
When SHCP and STCP are connected, the shift register advances one bit on each clock edge before the storage register captures its contents - resulting in Q0–Q7 always reflecting the previous shift cycle's data. This behavior is documented in the datasheet and can be used intentionally for pipeline delay, but requires careful timing analysis to avoid output misalignment.
Is Q7S output registered or combinatorial?
Q7S is a registered (clocked) output - it reflects the value of the internal Q6S node after the SHCP rising edge, not the raw serial input. This ensures clean, synchronous cascading: Q7S changes only on SHCP edges, eliminating glitches that could corrupt downstream DS inputs during asynchronous transitions.
How does SHR differ from STR in fault-handling scenarios?
SHR asynchronously clears only the shift register, leaving Q0–Q7 outputs unchanged - useful for discarding corrupted serial data without disrupting active outputs. STR clears only the storage register, forcing Q0–Q7 to LOW while permitting continued shift-register loading - enabling safe output shutdown during watchdog timeouts or emergency stops.
74AHCT594D,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74AHCT
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Shift Register
- Output Type:
- Push-Pull
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Function:
- Serial to Parallel, Serial
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
74AHCT594D,118 FAQ
1.How can I place an order for 74AHCT594D,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AHCT594D,118 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for 74AHCT594D,118 reliable?
The price and inventory of 74AHCT594D,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AHCT594D,118 is usually 5 days.
3.What payment methods are accepted for 74AHCT594D,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AHCT594D,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AHCT594D,118?
74AHCT594D,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AHCT594D,118 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for 74AHCT594D,118?
For technical support, including 74AHCT594D,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AHCT594D,118 requirements.
6.How does Aetrix verify that 74AHCT594D,118 is sourced from the original manufacturer or authorized distributors?
All 74AHCT594D,118 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 74AHCT594D,118 meets industry standards.
7.What is the process for return or replacement of 74AHCT594D,118?
All 74AHCT594D,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74AHCT594D,118, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The 74AHCT594D,118 part is unused and in its original packaging.
Return procedure for 74AHCT594D,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74AHCT594D,118 Tags
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74HC165D,653
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